mk: remove invalid phony target
mk: remove invalid phony target

There was a typo in the .PHONY for the test-build target. If we fix the
typo, the test-build target does not work, because it won't match the
'%' target anymore.

So just remove the .PHONY.

Fixes: 64592d97c1ae ("mk: do not build tests by default")

Signed-off-by: Olivier Matz <dfcc1510895413197abb4336e39bb0a3906cba71@6wind.com>
Acked-by: Ferruh Yigit <ba8734c3c506d2e3557bd4ac8fdaccd25bdb9aa7@intel.com>

john-mcnamara-intel/dpdk,john-mcnamara-intel/dpdk,john-mcnamara-intel/dpdk,john-mcnamara-intel/dpdk